Silencer

Abstract

The utility model relates to the technical field of noise suppression equipment, in particular to a silencer which comprises a shell internally provided with a cavity, an air inlet end is formed at one end of the cavity, the end, away from the air inlet end, of the cavity is an air outlet end, a silencing bin is arranged in the middle of the cavity, and the silencing bin is used for dividing the cavity into a separation bin and a reflection bin. A connecting pipe used for connecting the air inlet end and the noise reduction bin is arranged in the reflection bin, a plurality of through holes used for conducting noise into the reflection bin are formed in the connecting pipe, an extending pipe communicated with the connecting pipe is arranged in the noise reduction bin, the noise in the separation bin and the noise in the reflection bin are conducted into the noise reduction bin, then the noise is offset, and a connecting assembly is arranged at the air inlet end. According to the utility model, the silencing mode not only has small influence on exhaust resistance, but also adopts a reflection counteracting mode to reduce noise, so that the use effect of the silencer is better.

Description

Technical Field

[0001] The utility model relates to the technical field of noise suppression equipment, in particular to a muffler. Background Art

[0002] A silencer is a noise reduction device that can be used to reduce the noise in a noise-transmitting airflow duct by using pipes and elbows with sound-absorbing lining or pipes with sudden changes in cross-sectional area and other discontinuous acoustic impedance, so as to attenuate or reflect the noise in the duct. The former is called a resistive silencer, the latter is called a reactive silencer, and there are also impedance composite silencers.

[0003] In a muffler disclosed in my country's public patent CN220731170U, multiple through holes are used to divert the gas, which changes the flow direction of the gas during the flow, prolongs the flow time, and thus achieves a better muffler effect. However, the longer the gas flow time, the greater the exhaust resistance, which increases the energy consumption of the airflow output device, so there is room for improvement. Utility Model Content

[0004] The purpose of the utility model is to provide a muffler to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A silencer comprises a shell with a cavity therein, wherein one end of the cavity forms an air inlet end, and the end of the cavity away from the air inlet end is an air outlet end. A silencer chamber is arranged in the middle of the cavity, and the silencer chamber is used to divide the cavity into a separation chamber and a reflection chamber. A connecting pipe for connecting the air inlet end and the silencer chamber is arranged in the reflection chamber, and a plurality of through holes are formed in the connecting pipe for transmitting noise into the reflection chamber. An extension pipe connected to the connecting pipe is arranged in the silencer chamber, and the noise in the separation chamber and the reflection chamber is transmitted to the silencer chamber so that the noise cancels each other out. A connecting component is arranged at the air inlet end.

[0007] Preferably, the silencer chamber includes two partitions fixedly connected to the outer shell, a plurality of reflection rings are fixedly connected between the two partitions, the extension tube is fixedly connected to the two partitions, a plurality of clearance holes are opened on the two partitions, and the clearance holes are arranged on the partitions between adjacent reflection rings.

[0008] Preferably, the connecting assembly includes an outer tube connected to the air inlet end of the outer tube, a rotary sleeve is threadedly connected to the outer tube, a plurality of indentation grooves are opened at one end of the outer tube away from the outer tube, a plurality of wedge blocks are fixedly connected to the side walls of the outer tube close to the indentation grooves, a conical sleeve is fixedly connected to one end of the rotary sleeve close to the wedge blocks, the inner wall of the conical sleeve is arranged to abut against the wedge blocks, and a sealing sleeve is fixedly connected to the inner wall of the outer tube close to the indentation grooves.

[0009] Preferably, an exhaust pipe is also connected to the air outlet end of the housing. The end of the exhaust pipe away from the housing is sealed, and a plurality of exhaust holes are provided in a circumferential arrangement on the side wall of the exhaust pipe.

[0010] Preferably, the housing is spindle-shaped, and the inner diameter of the separation chamber is larger than that of the reflection chamber.

[0011] Preferably, the outer wall of the housing is coated with sound-absorbing cotton.

[0012] Preferably, the cross-section of the reflection ring is V-shaped, and the reflection ring is a thin metal plate.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1. For this muffler, by arranging the housing, the connecting pipe and the sound-absorbing chamber, when the air flow passes through the connecting pipe, the vibration of part of the noise is converted into the vibration of the connecting pipe, thereby muffling the noise and conducting part of the noise entering the reflection chamber into the sound-absorbing chamber. After the air flow passes through the extension pipe and enters the separation chamber, most of the noise is muffled in the separation chamber and part of the noise is reflected into the sound-absorbing chamber for conduction, so that the noise entering the sound-absorbing chamber is reflected and offset, thereby improving the muffling effect. At the same time, this muffling method not only has little influence on the exhaust resistance, but also uses the method of reflection and cancellation to reduce noise, making the use effect of this muffler better.

[0015] 2. For this muffler, by arranging the connecting component, the outer pipe is sleeved on the air flow output pipeline, and then by screwing the rotating sleeve, the quick connection of the air flow output pipeline and the outer pipe can be realized, and the airtightness of the connection between the pipeline and the outer pipe can be ensured with the cooperation of the sealing sleeve, making the disassembly and assembly of this muffler more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of a muffler in the present utility model.

[0017] Figure 2 It is a schematic cross-sectional structural diagram of the muffler in the present utility model.

[0018] Figure 3 It is a schematic semi-cross-sectional structural diagram of the sound-absorbing chamber in the present utility model.

[0019] Figure 4 It is Figure 2 an enlarged structural diagram of part A in

[0020] The meanings of the reference numerals in the figure are as follows: 1. Outer shell; 2. Connecting component; 21. Outer tube; 22. Swivel sleeve; 23. Indented groove; 24. Wedge block; 25. Tapered sleeve; 26. Sealing sleeve; 3. Sound absorption chamber; 31. Partition board; 32. Reflection ring; 33. Relief hole; 4. Separation chamber; 5. Reflection chamber; 6. Connecting pipe; 7. Flexible pipe; 8. Extension pipe; 9. Through hole; 10. Exhaust pipe; 11. Sound-absorbing cotton. Detailed implementation mode

[0021] To further understand the content of the present utility model, the present utility model will be described in detail with reference to the accompanying drawings and embodiments. It should be understood that the embodiments are only for explaining the present utility model and not for limiting it.

[0022] The following will be further described in detail with reference to the attached Figures 1 - 4 This embodiment will be further described in detail.

[0023] Please refer to Figures 1 - 4 , a muffler in this embodiment includes an outer shell 1 with an internal cavity. One end of the cavity forms an air inlet end, and the end of the cavity far from the air inlet end is the air outlet end: Among them, the outer shell 1 is in the shape of a spindle with a smaller diameter at one end and a larger diameter at the other end. The air inlet end is located at the end with a smaller diameter, and the air outlet end is located at the end with a larger diameter;

[0024] A sound absorption chamber 3 is arranged in the middle of the cavity. The sound absorption chamber 3 is used to divide the cavity into a separation chamber 4 connected to the air outlet end and a reflection chamber 5 connected to the air inlet end. A connecting pipe 6 for connecting the air inlet end and the sound absorption chamber 3 is arranged in the reflection chamber 5. The connecting pipe 6 is provided with a plurality of through holes 9 for conducting noise into the reflection chamber 5. An extension pipe 8 communicated with the connecting pipe 6 is arranged in the sound absorption chamber 3. Both ends of the connecting pipe 6 are respectively communicated with the outer shell 1 and the sound absorption chamber 3 through a flexible pipe 7. After the noise in the separation chamber 4 and the reflection chamber 5 is conducted into the sound absorption chamber 3, the noise cancels each other out, and a connecting component 2 is arranged at the air inlet end.

[0025] With the structure of this embodiment, after the air flow enters the housing 1 from the air inlet end, it enters the extension pipe 8 through the connecting pipe 6 and then enters the separation chamber 4, and is discharged from the air outlet end. Since both ends of the connecting pipe 6 are connected to the air inlet end of the housing 1 and the sound insulation chamber 3 through hoses 7, when the air flow passes through the connecting pipe 6, it is easier to drive the connecting pipe 6 to vibrate, and the noise in the air flow can be conducted to the reflection chamber 5 to a certain extent, thereby consuming the kinetic energy of the noise sound wave. The through holes 9 provided on the connecting pipe 6 are also used to allow part of the noise in the air flow flowing through the connecting pipe 6 to enter the reflection chamber 5. Moreover, since the air pressure inside the entire housing 1 is relatively stable, only a small amount of air flow will overflow from the through holes 9. Therefore, the exhaust resistance of the air flow will not be increased too much. After the air flow enters the separation chamber 4 through the extension pipe 8, most of the sound waves are reflected in the separation chamber 4, so that most of the noise in the air flow is dispersed. In this state, most of the sound waves will be silenced after colliding with the inner wall of the separation chamber 4. At the same time, part of the sound waves will be reflected in the separation chamber 4 and enter the sound insulation chamber 3. The sound waves entering the reflection chamber 5 will also generate some sound waves entering the sound insulation chamber 3 after being reflected by it. Furthermore, the noise in the separation chamber 4 and the reflection chamber 5 is conducted to the sound insulation chamber 3 and the noise cancels each other out, preferably improving the sound insulation effect of the muffler;

[0026] In this embodiment, after the air flow passes through this type of muffler, most of the noise is separated from the air flow through the connecting pipe 6 and the separation chamber 4, so that the discharged air flow has less noise and can achieve a better noise suppression effect. The noise conducted to the reflection chamber 5 and the separation chamber 4 is conducted to the sound insulation chamber 3 after being reflected by the reflection chamber 5 and the separation chamber 4. After the noise sound wave enters the sound insulation chamber 3, most of the sound waves can cancel each other out, so that the noise sound wave is further attenuated, and finally a better sound insulation effect is achieved. And this type of muffler has less resistance to the air flow during use, meeting the actual needs of users.

[0027] Please refer to Figure 3 , in this embodiment, the sound insulation chamber 3 includes two partitions 31 fixedly connected to the housing 1. A plurality of reflection rings 32 are fixedly connected between the two partitions 31. The extension pipe 8 penetrates through the middle parts of the two partitions 31. A plurality of relief holes 33 are provided on both of the two partitions 31, and the relief holes 33 are provided on the partitions 31 between adjacent reflection rings 32.

[0028] With the structure of this embodiment, through the setting of the relief holes 33, it is convenient for the noise sound wave to enter the sound insulation chamber 3 therefrom, and then the noise sound waves can cancel each other out in the sound insulation chamber 3, consuming the sound wave kinetic energy and making it decay rapidly;

[0029] Among them, the reflection ring 32 is arranged along the circumferential direction of the extension pipe 8, and the middle part of the reflection ring 32 is bent. Thus, on the one hand, the reflection ring 32 can further promote the reflection of sound waves in the sound absorption chamber 3 to enhance the sound absorption effect. On the other hand, the noise sound waves will drive the reflection ring 32 to vibrate, which will cause the kinetic energy of the sound waves to be consumed more quickly, thereby further improving the noise suppression effect.

[0030] Please refer to Figures 2 - 4 , in this embodiment, the connection component 2 includes an outer pipe 21 communicated with the outer shell 1. The outer pipe 21 is made of elastic metal. A swivel sleeve 22 is threadedly connected to the outer pipe 21. A plurality of indentation grooves 23 are formed at one end of the outer pipe 21 away from the outer shell 1. The indentation grooves 23 are arranged along the circumferential direction of the outer pipe 21. A plurality of wedge-shaped blocks 24 are fixedly connected to the side wall of the outer pipe 21 near the indentation grooves 23. A conical sleeve 25 is fixedly connected to one end of the swivel sleeve 22 close to the wedge-shaped blocks 24. The inner wall of the conical sleeve 25 abuts against the wedge-shaped blocks 24. A sealing sleeve 26 is fixedly connected to the inner wall of the outer pipe 21 near the indentation grooves 23.

[0031] Through the structure of this embodiment, the muffler can be better connected to the air flow output pipeline through the connection component 2, making the disassembly and assembly of the muffler on the air flow output pipeline more convenient;

[0032] During actual use, directly sleeved the outer pipe 21 on the air flow output pipeline, and then rotate the swivel sleeve 22 to move it towards the wedge-shaped block 24. At this time, the inner wall of the conical sleeve 25 abuts against the wedge-shaped block 24. Utilizing the deformation ability of the outer pipe 21, the wedge-shaped block 24 drives the part of the outer pipe 21 provided with the indentation grooves 23 to deform towards the air flow output pipeline. At this time, this part of the outer pipe 21 clamps and holds the outer wall of the air flow output pipeline, thereby realizing the connection between the air flow output pipeline and the outer pipe 21. Among them, through the setting of the sealing sleeve 26, the opening of the air flow output pipeline extends into the sealing sleeve 26 to ensure the sealing effect at the connection between the air flow output pipeline and the outer pipe 21.

[0033] Please refer to Figure 2 , in this embodiment, an exhaust pipe 10 is fixedly connected to one end of the outer shell 1 away from the connection component 2. One end of the exhaust pipe 10 away from the outer shell 1 is sealed. A plurality of exhaust holes are formed in a circumferentially arranged manner on the side wall of the exhaust pipe 10. Since one end of the exhaust pipe 10 away from the outer shell 1 is in a sealed state, it can only be discharged through the exhaust holes. In this way, the exhaust pipe 10 can further muffler the air flow discharged from the outer shell 1, making the muffling effect of the muffler better.

[0034] In this embodiment, the outer wall of the outer shell 1 is coated with sound-absorbing cotton 11. When this muffler is in use, the overall vibration of the outer shell 1 still causes noise and some noise is conducted outward. The setting of the sound-absorbing cotton 11 can suppress the outward conduction of this part of the noise, further improve the sound insulation effect, and at the same time avoid the noise generated when the outer shell 1 vibrates and collides with other objects.

[0035] Please refer to Figure 3 , in this embodiment, the cross-section of the reflection ring 32 is V-shaped. The reflection ring 32 is a thin metal plate. By using the reflection ring 32 with a V-shaped cross-section, the area of the reflection ring 32 can be increased, and the length of the channel between two adjacent reflection rings 32 can be extended, thereby improving the cancellation effect of the noise between the reflection rings 32. Moreover, the reflection ring 32 of this shape is difficult to vibrate under the drive of the noise, enabling the reflection ring 32 to more effectively consume the kinetic energy of the sound wave and further improve the suppression effect on the noise.

[0036] Working principle: When using this muffler, first, the outer tube 21 is sleeved on the air flow output pipeline. Then, when the rotating sleeve 22 is turned, when the rotating sleeve 22 moves towards the air flow output pipeline, the conical sleeve 25 and the wedge-shaped block 24 are used in cooperation to drive the outer tube 21 with the indented groove 23 part to deform towards the air flow output pipeline. At this time, this part of the outer tube 21 clamps and holds the outer wall of the air flow output pipeline, thereby realizing the installation of this muffler on the air flow output pipeline; Subsequently, the air flow output from the air flow output pipeline flows into the inner part of the outer shell 1 and is discharged from the exhaust pipe 10. Among them, a part of the noise passes through the through hole 9 on the connecting pipe 6, so that part of the noise is silenced, and part of the noise enters the reflection chamber 5 and is reflected into the sound insulation chamber 3. At the same time, as the air flow continues to flow, after the air flow enters the separation chamber 4, most of the sound waves are silenced in the separation chamber 4 and part of the noise is reflected into the sound insulation chamber 3, so that it cancels out the noise reflected into the sound insulation chamber 3 from the reflection chamber 5, thereby improving the sound insulation effect of this muffler.

[0037] In summary, the above are only the preferred embodiments of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope covered by the patent of the present invention.

Claims

1. A muffler, comprising a housing (1) with a cavity therein, one end of the cavity forming an air inlet end, and an end of the cavity away from the air inlet end forming an air outlet end, characterized in that: A silencer chamber (3) is provided in the middle of the cavity, the silencer chamber (3) is used to divide the cavity into a separation chamber (4) and a reflection chamber (5), a connecting pipe (6) for connecting an air inlet end and the silencer chamber (3) is provided in the reflection chamber (5), a plurality of through holes (9) are provided in the connecting pipe (6) for transmitting noise into the reflection chamber (5), an extension pipe (8) connected to the connecting pipe (6) is provided in the silencer chamber (3), the noise in the separation chamber (4) and the reflection chamber (5) is transmitted to the silencer chamber (3) so that the noises cancel each other out, and a connecting assembly (2) is provided at the air inlet end.

2. A muffler according to claim 1, characterized in that: The muffler chamber (3) comprises two partitions (31) fixedly connected to the outer shell (1), a plurality of reflection rings (32) are fixedly connected between the two partitions (31), an extension tube (8) passes through the middle of the two partitions (31), and a plurality of clearance holes (33) are formed on the two partitions (31), wherein the clearance holes (33) are arranged on the partitions (31) between adjacent reflection rings (32).

3. A muffler according to claim 1, characterized in that: The connection assembly (2) comprises an outer tube (21) connected to the air inlet end of the outer shell (1), a rotary sleeve (22) being threadedly connected to the outer tube (21), a plurality of indentation grooves (23) being formed at one end of the outer tube (21) away from the outer shell (1), a plurality of wedge blocks (24) being fixedly connected to the side wall of the outer tube (21) close to the indentation grooves (23), a conical sleeve (25) being fixedly connected to one end of the rotary sleeve (22) close to the wedge blocks (24), an inner wall of the conical sleeve (25) being arranged to abut against the wedge blocks (24), and a sealing sleeve (26) being fixedly connected to the inner wall of the outer tube (21) close to the indentation grooves (23).

4. A muffler according to claim 3, characterized in that: The gas outlet end of the housing (1) is also connected to an exhaust pipe (10); one end of the exhaust pipe (10) away from the housing (1) is sealed; and a plurality of exhaust holes arranged around the side wall of the exhaust pipe (10) are provided.

5. A muffler according to claim 1, characterized in that: The shape of the outer shell (1) is spindle-shaped, and the inner diameter of the separation chamber (4) is larger than the inner diameter of the reflection chamber (5).

6. A muffler according to claim 1, characterized in that: The outer wall of the housing (1) is covered with sound-absorbing cotton (11).

7. A muffler according to claim 2, characterized in that: The cross section of the reflection ring (32) is V-shaped, and the reflection ring (32) is a metal thin plate.

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